Portable hoisting jack



Nov. 19, 1940. o. E. sANDsTRoM PORTABLE HOISTING JACK Filed March 20, 1940 2 Sheets-Sheet 1 A orneys NGV. 19, 1940- o. E. suus'mowx `:PORTABLE HOISTING JACK Filed Maron 2o, 1946 l 2 sheets-sheet 2 A forne ys Patented Nov. 19, 1940 UNITED As'rlxr1s1s PATENT OFFICE Z Claims.

rl'he present invention relates to jacks of a type adapted to hoist heavy machinery, `and other objects, where the object occupies or is desired to be moved a substantial distance above the 5, ground, or to load and unload truck bodies, and

for similar purposes, and has for its primary object to provide an upstanding frame on which the hoisting platform is slidably mounted and providing a exible hoisting connection. between the lo platform and a gear operated drum to raise the platform into the desired position.

A still further object is to provide a supporting base for the frame having wheels mounted thereon normally in a position out of engagement with the ground when the trame is in an upright position, the wheels being adapted for movement into engagement with the ground by a tilting action ol' the frame whereby to enable the jack to be moved into the desired position l'or engaging g@ the object to be hoisted.

il. still further object is to provide an apparatus of this character ot" simple and practical con-- struction, which is strong and durable, relatively inexpensive to manufactulre and otherwise well adapted ior the purposes for which the same is intended.

Other objects and advantages reside in the de tails of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which- Figure l is a front elevational view.

Figure 2 is a side elevational view.

Figure 3 is a rear elevational view.

Figure 4 is a transverse sectional view taken substantially on a line 4-4 of Figure 2, and

Figure 5 is a top plan. view of the base and with the upstanding frame members shown insection.

Referring now to the drawings in detail, the numeral 5 designates an upstanding frame generally which is composed of a pair of spaced parallel channel irons (i having their channels arranged in opposed relation as shown more clearly in Figures 4 and 5 of the drawings, the frames being secured in spaced relation by spacing members l. The lower ends of the frame members 6 are curved outwardly'in opposite directions to provide horizontal supporting feet ii, the outer end portions of which are welded or otherwise permanently secured to a substantially U-shaped base 9 which projects horizontally rearwardly from the upstandng frame members (i and is connected thereto by brace members l0 which extend from the bight portion of the base to the rear edge of the frame members. Side brace members Il also extend from the side edges of the respective frame members 6 to the end portions of the U-shaped base 9.

The spacing members l, braces l0 and il vas well as the base 9 are welded or otherwise permancntly secured to their respective connected parts.

Also similarly secured to the brace members it w are brackets l2 xedly securing an axle it to the brace members and on the ends of the axle are journalled wheels lll, the wheels normally being maintained in an elevated position out of contact with the ground when the frame is sup- MI, ported in an upright position as shown more clearly in Figure 2 of the drawings. However, as m'ore clearly shown in Figures 2 and 5 oi' the drawings, the rear edge of the wheels project beyond the rear end of the frame 9 so that when the frame is tilted rearwardly the wheels will engage the ground to facilitate transporting of the hoist to the desired position for engaging the work.

A combined drum and gear housing lil is se o5 cured to the frame members ti by means of bolts or the like it, the housing being provided with a removable end plate ll secured in position by bolts it. Bearing bosses lil and 2li are formed in the closed end of the housing as well as in the 30 cover plate lll, respectively, and in which are journalled the ends of a shaft 2l, the shaft being formed with a drum 22 and a worm gear `it at the end thereof adjacent the cover plate il as more clearly shown in Figure 4 of the draw- $5 ings.

A crank arm 2li has one end projecting into and journallecl in the housing l5 and on the inner end of the crank arm is secured a worm 25 engaging with the worm gear 23 whereby to` ,m provide for the rotation of the drum 22. A chain, cable, or other flexible member 26 has one end secured to the drum and extends outwardly through an opening 21 in the housing and upwardly over a pulley 28 journalled in brackets 29 45 suitably secured at the rear upper ends of the frame members 6, the chain then extending downwardly between the frame members and has its other end secured to a carrier 3D slidably mounted inthe channels of the frame members 6. 50

Projecting horizontally from the carrier 3U and extending outwardly between the Aspaced edges of the frame members 6, is a work-engaging platform 3|, the platform, at its under side, being provided with a bracing web 32 welded or other- 55 wise secured to the lower portion of the carrier 30.

In the operation of the device it will be apparent that the hoist may be tilted backwardly upon the wheels il whereby to move the same into the desired position for engaging the work and the platform 3| may then be adjusted to the proper position under the work and upon the operation of the crank 24 the platform will be yraised for hoisting purposes. By reason of the worm vand worm gear construction the platform will be maintained in its adjusted position without the necessity of employing stops or other devices to prevent gravitating action of the platform.

It is believed the details of construction, operation and advantages ofthe device will be readily understood from the foregoing without further detailed explanation.

Having thus described the invention, what I claim isl. A hoist comprising a pair of spaced parallel upstanding channel members having their channels arranged in opposed relation, said members having their lower ends bent outwardly for fiatwise resting on the ground. a horizontal frame member connected to said outwardly bent ends and cooperating therewith to form a supporting base, a carrier slidably mounted in the channels of said channel members. a work-engaging Platform projecting horizontally from said carrier and means connected to said carrier for raising and lowering the platform.

2. A hoisting jack. of the character described 'comprising a pair of upstanding channel frame members having the channels thereof arranged in opposed relation, spacing members securing the channel members in spaced parallel relation, the lower ends of said channel members extendlng horizontally outwardly to provide supporting feet for the bottom of said channel members, a 

